Data from Vostok file contents age, flux (in milligrams of dust per year and per square meters) This was deduced from the published data assuming a dust density of 2, and is more convenient value. Original data are smoothed using a spline function. age dust flux mg m-2 a-1 4000 0.406541 4364.72 0.418588 4729.45 0.431 5094.18 0.445058 5458.91 0.466813 5823.64 0.503371 6188.37 0.555875 6553.1 0.615941 6917.83 0.669128 7282.56 0.702087 7647.29 0.714204 8012.02 0.708657 8376.75 0.689536 8741.48 0.663658 9106.2 0.641878 9470.94 0.630712 9835.66 0.626219 10200.4 0.622487 10565 0.622147 10929.9 0.637303 11294.5 0.683578 11659.2 0.785293 12024 0.982407 12388.7 1.3166 12753.5 1.8111 13118.2 2.4594 13483 3.2269 13847.7 4.0616 14212.4 4.8932 14577.2 5.6603 14941.9 6.3387 15306.5 6.9393 15671.2 7.4493 16036 7.9181 16400.8 8.457 16765.5 9.0775 17130.3 9.671 17495 10.1896 17859.5 10.6453 18224.4 11.0522 18589 11.3799 18953.9 11.5644 19318.5 11.6956 19683.4 11.9398 20048 12.3782 20412.8 12.9107 20777.5 13.3317 21142.3 13.447 21507 13.1669 21871.5 12.5426 22236.5 11.7625 22601 11.1216 22965.9 10.7938 23330.5 10.7334 23695.4 10.7626 24060 10.6792 24424.8 10.3395 24789.5 9.7233 25154.3 8.929 25519 8.1147 25883.8 7.4392 26248.5 7.0121 26613 6.8452 26978 6.8562 27342.5 6.9377 27707.4 7.0131 28072 7.0336 28436.9 6.971 28801.5 6.8153 29166.3 6.567 29531 6.2296 29895.8 5.8065 30260.5 5.3082 30625.3 4.7552 30990 4.1802 31354.5 3.628 31719.4 3.1512 32084 2.8059 32448.9 2.6387 32813.6 2.6687 33178.3 2.8637 33543.1 3.1479 33907.8 3.4274 34272.5 3.6135 34637.3 3.6454 35002 3.5197 35366.6 3.3003 35731.5 3.0493 36096.1 2.8112 36460.8 2.6127 36825.6 2.4656 37190.3 2.3696 37555.1 2.3199 37919.8 2.3106 38284.6 2.3339 38649.3 2.3769 39014 2.4206 39378.8 2.4487 39743.5 2.455 40108.1 2.4472 40472.8 2.448 40837.6 2.4913 41202.3 2.6016 41567.1 2.7856 41931.8 3.0243 42296.6 3.2625 42661.3 3.4212 43026.1 3.4738 43390.8 3.4258 43755.5 3.294 44120.1 3.1006 44485 2.8696 44849.6 2.6267 45214.3 2.3954 45579.1 2.1962 45943.8 2.0438 46308.6 1.9421 46673.3 1.8841 47038.1 1.8747 47402.8 1.9266 47767.5 2.0445 48132.3 2.206 48497 2.3541 48861.6 2.4434 49226.5 2.4648 49591.1 2.4356 49955.8 2.3864 50320.6 2.3469 50685.3 2.3295 51050.1 2.331 51414.8 2.3459 51779.6 2.3809 52144.3 2.4643 52509 2.6291 52873.6 2.9071 53238.5 3.3263 53603.1 3.8999 53967.8 4.6074 54332.6 5.3578 54697.3 6.0204 55062.1 6.4703 55426.8 6.6302 55791.6 6.5207 56156.3 6.2788 56521 6.0338 56885.8 5.8801 57250.5 5.8845 57615.1 6.0875 57980 6.4951 58344.6 7.0514 58709.3 7.6599 59074.1 8.2117 59438.8 8.6195 59803.6 8.8553 60168.3 8.9547 60533.1 8.9381 60897.8 8.808 61262.5 8.5786 61627.3 8.3101 61992 8.1198 62356.6 8.0856 62721.3 8.1637 63086.1 8.1999 63450.8 8.0124 63815.6 7.4889 64180.3 6.6605 64545.1 5.6466 64909.8 4.5874 65274.6 3.5865 65639.2 2.7056 66004 1.9907 66368.7 1.4812 66733.5 1.1729 67098.2 1.0315 67462.7 1.0133 67827.7 1.0761 68192.2 1.187 68557.1 1.3237 68921.7 1.4481 69286.6 1.5201 69651.2 1.5181 70016 1.4499 70380.7 1.3463 70745.5 1.234 71110.2 1.132 71475 1.0564 71839.7 1.0226 72204.2 1.045 72569.1 1.1342 72933.7 1.2923 73298.6 1.5136 73663.2 1.7853 74028.1 2.088 74392.7 2.3922 74757.5 2.6608 75122.2 2.8626 75487 2.974 75851.7 2.9797 76216.2 2.879 76581.2 2.6968 76945.7 2.4873 77310.6 2.2998 77675.2 2.165 78040.1 2.0874 78404.7 2.0358 78769.5 1.9567 79134.2 1.8254 79499 1.6482 79863.7 1.4497 80228.5 1.2612 80593.2 1.1085 80957.7 1.004 81322.6 0.947065 81687.2 0.930913 82052.1 0.947075 82416.7 0.987456 82781.6 1.045 83146.2 1.1176 83511 1.2073 83875.7 1.3179 84240.5 1.4506 84605.2 1.5998 84969.7 1.7514 85334.7 1.8864 85699.2 1.9856 86064.1 2.0358 86428.7 2.0351 86793.6 2.0003 87158.2 1.9609 87523 1.9488 87887.7 1.989 88252.5 2.0897 88617.2 2.235 88982 2.3905 89346.7 2.5138 89711.2 2.5649 90076.2 2.5183 90440.7 2.3748 90805.6 2.1565 91170.2 1.8981 91535.1 1.6359 91899.7 1.3998 92264.5 1.2028 92629.2 1.043 92994 0.916329 93358.7 0.820527 93723.2 0.755121 94088.2 0.719199 94452.7 0.709293 94817.6 0.720839 95182.2 0.750694 95547.1 0.799109 95911.7 0.871246 96276.6 0.977754 96641.2 1.1266 97006 1.3054 97370.7 1.4875 97735.5 1.6457 98100.2 1.7648 98464.7 1.8501 98829.7 1.916 99194.2 1.9796 99559.1 2.058 99923.7 2.1653 100289 2.3077 100653 2.4733 101018 2.6356 101383 2.7597 101747 2.8132 102112 2.7742 102477 2.6362 102842 2.4085 103206 2.122 103571 1.818 103936 1.5421 104301 1.3313 104665 1.2032 105030 1.1505 105395 1.151 105760 1.1756 106124 1.1972 106489 1.1971 106854 1.1706 107218 1.1291 107583 1.0827 107948 1.0367 108313 0.991838 108677 0.946463 109042 0.899288 109407 0.852005 109772 0.805367 110136 0.756401 110501 0.699883 110866 0.632587 111230 0.556707 111595 0.482693 111960 0.429734 112325 0.409783 112689 0.423857 113054 0.465785 113419 0.525168 113784 0.589522 114148 0.64668 114513 0.689641 114878 0.712903 115242 0.716637 115607 0.706007 115972 0.688044 116337 0.668149 116701 0.653539 117066 0.651514 117431 0.661807 117796 0.679695 118160 0.699948 118525 0.716268 118890 0.732091 119255 0.763026 119619 0.818657 119984 0.893121 120349 0.966678 120713 1.0126 121078 1.0223 121443 1.0108 121808 0.99771 122172 0.992098 122537 0.991973 122902 0.997803 123267 1.0109 123631 1.0411 123996 1.1126 124361 1.2351 124725 1.3796 125090 1.4834 125455 1.5008 125820 1.4595 126184 1.3999 126549 1.3438 126914 1.2944 127279 1.235 127643 1.1549 128008 1.0771 128373 1.0403 128737 1.0752 129102 1.1961 129467 1.3971 129832 1.6587 130196 1.9513 130561 2.2334 130926 2.4268 131291 2.4343 131655 2.2573 132020 1.9738 132385 1.6808 132750 1.4424 133114 1.2809 133479 1.1872 133844 1.1221 134208 1.0431 134573 0.937434 134938 0.835113 135303 0.755513 135667 0.701089 136032 0.66521 136397 0.637271 136762 0.603444 137126 0.569136 137491 0.552083 137856 0.569541 138220 0.629918 138585 0.733582 138950 0.879542 139315 1.0765 139679 1.3255 140044 1.6162 140409 1.9139 140774 2.1586 141138 2.2934 141503 2.3654 141868 2.4435 142232 2.598 142597 2.8507 142962 3.1642 143327 3.4422 143691 3.5543 144056 3.4922 144421 3.3964 144786 3.3843 145150 3.5081 145515 3.7681 145880 4.1186 146244 4.4803 146609 4.7826 146974 4.9651 147339 5.0549 147703 5.0888 148068 5.0755 148433 5.0218 148798 4.9799 149162 5.0345 149527 5.2344 149892 5.5696 150257 5.9614 150621 6.299 150986 6.5134 151351 6.6084 151715 6.6215 152080 6.5884 152445 6.5416 152810 6.5267 153174 6.5982 153539 6.7748 153904 6.9967 154269 7.1595 154633 7.1667 154998 6.9803 155363 6.649 155727 6.2464 156092 5.8392 156457 5.4816 156822 5.2029 157186 5.0094 157551 4.8875 157916 4.8072 158281 4.716 158645 4.5408 159010 4.2201 159375 3.7685 159739 3.3089 160104 2.967 160469 2.8078 160834 2.84 161198 3.0347 161563 3.338 161928 3.6717 162293 3.9494 162657 4.1064 163022 4.1301 163387 4.0523 163752 3.9288 164116 3.8217 164481 3.7882 164846 3.8747 165210 4.1068 165575 4.487 165940 4.9799 166305 5.5064 166669 5.9725 167034 6.3171 167399 6.5519 167764 6.7972 168128 7.2158 168493 7.9025 168858 8.8125 169222 9.8078 169587 10.7303 169952 11.4383 170317 11.8436 170681 11.9043 171046 11.6255 171411 11.0684 171776 10.341 172140 9.5662 172505 8.8402 172870 8.2177 173234 7.6911 173599 7.2116 173964 6.7284 174329 6.2075 174693 5.6437 175058 5.0475 175423 4.446 175788 3.8706 176152 3.356 176517 2.9345 176882 2.6425 177247 2.508 177611 2.544 177976 2.7526 178341 3.1268 178705 3.6426 179070 4.2517 179435 4.8607 179800 5.3557 180164 5.6293 180529 5.6158 180894 5.32 181259 4.817 181623 4.2179 181988 3.6304 182353 3.1423 182717 2.7979 183082 2.6092 183447 2.5751 183812 2.6837 184176 2.9134 184541 3.2391 184906 3.6339 185271 4.0745 185635 4.5398 186000 5.0168